Improved Three-Phase AFD Islanding Detection Based on Digital Control and Non-Detection Zone Elimination

Xinxin Zheng, Rui Zhang, Xi Chen and Nong Sun
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Xinxin Zheng: Automobile Engineering Technology Research Institution, Hefei University of Technology, Hefei 230009, China
Rui Zhang: Automobile Engineering Technology Research Institution, Hefei University of Technology, Hefei 230009, China
Xi Chen: State Grid Hefei Electric Power Supply Company, Hefei 230001, China
Nong Sun: State Grid Hefei Electric Power Supply Company, Hefei 230001, China

Energies, 2018, vol. 11, issue 9, 1-15

Abstract: This paper proposes an improved active frequency drift (AFD) islanding detection method of a three-phase inverter. Different than the existing single-phase AFD method, in the three-phase system, the disturbance is added to the phase angle, which takes part in coordinate transformation calculations. Thus, the frequency drift of the three-phase reference current can be realized by the disturbance of the phase angle. It is unnecessary to add frequency drift to each phase respectively with the proposed method, which can simplify the control system. Furthermore, the non-detection zone can be eliminated by updating certain parameters; therefore, the detection method is sensitive. In this paper, the application of the proposed method in a digital control system is discussed in detail. The non-detection zone is analyzed, and an elimination method is proposed. Finally, the simulation and experimental results are given to verify the theoretical analysis.

Keywords: three-phase inverter; islanding detection; non-detection zone; zero-crossing correction; active frequency drift (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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